【摘要】 分别用超声分散法和研磨法制备了纳米羟基磷灰石(n-HA)/聚1,2-丙二醇-癸二酸-柠檬酸酯复合材料。通过差示扫描量热法、扫描电子显微镜和透射电子显微镜对复合材料中n-HA的分散性及复合材料的玻璃化转变温度进行了分析,测试了复合材料的溶胶含量、力学性能及降解性能。结果表明,无论是采用研磨法还是超声分散法制备的复合材料,其玻璃化转变温度和溶胶含量都随着n-HA质量分数的增加而降低,降解速率都随着n-HA质量分数的增加而减小。研磨法是改善n-HA在复合材料中的分散性、提高复合材料力学性能的有效方法。用该方法通过改变n-HA质量分数可使复合材料的拉伸强度提高8.2倍,弹性模量提高11.4倍,而扯断伸长率基本保持不变。更多还原

【Abstract】 Nano-hydroxyapatite(n-HA)/poly[(1,2-propanediol-sebacate)-citrate] (1,2-PPSC) composites were synthesized by ultrasonic dispersion method and grinding method respectively. The dispersion property of n-HA in n-HA/1,2-PPSC composites and glass transition temperature of two composites were analyzed by differential scanning calorimetry,scanning electron microscopy and transmission electron microscopy. The sol content,mechanical properties and degradation performance of n-HA/1,2-PPSC composites were also tested. The results showed that both the glass transition temperature and sol content of n-HA/1,2-PPSC composites decreased with the increase of mass fractions of n-HA and so did the degradation rate. The grinding method was an effective method to improve the dispersibility of n-HA and the mechanical properties of the composites. With the method,the tensile strength increased by 8.2 times,the modulus increased by 11.4 times,the elongation at break had little change.更多还原